package com.gzs.space.filter;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @author GZS
 * @date 2022年05月14日
 * 权限验证过滤器
 */
@Component
public class AccessFilter implements GlobalFilter, Ordered {

	private Logger log = LoggerFactory.getLogger(AccessFilter.class);

	@Override
	public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
		String token = exchange.getRequest().getHeaders().getFirst("token");
		if (token == null){
			log.warn("token is null...");
			ServerHttpResponse response = exchange.getResponse();
			response.getHeaders().add("Content-Type","application/json;charset=utf-8");
			response.setStatusCode(HttpStatus.UNAUTHORIZED);
			String message = "{\"message\":\"" + HttpStatus.UNAUTHORIZED.getReasonPhrase() + "\"}";
			DataBuffer buffer = response.bufferFactory().wrap(message.getBytes());
			return response.writeWith(Mono.just(buffer));
		}
		log.info("token is ok...");
		return chain.filter(exchange);
	}

	@Override
	public int getOrder() {
		return 0;
	}
}
